Today's Date: 2019-05-19

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Scab Epidemic Risk Model 

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Plant Pathologist Commentary: Small Grains Disease Update 07/03/2018

Conditions around the state are challenging with many areas having received high amounts of rainfall and continuing to received rain fall through thunderstorm events.

The rainfall and warm temperatures are creating the humidity idea for fungal diseases. In addition to these conditions, hail damage experienced in some areas is also providing ideal conditions for Bacterial leaf streak to take hold.These conditions are also making it difficult to get fungicide applications on to crops in a timely fashion.

What's Out There? With much of the crop headed and even flowered, one of the main concerns is FHB development. FHB has been observed in winter wheat plots in southern part of the state with early awn infections present in commercial fields in the Northwest. Risk models are trending high to moderate risk for both susceptible and moderately resistant varieties in the southern half of the state and for large areas in the north central part of the state. The optimal time to make applications for disease and DON control is early flowering, Feekes 10.5.1, when yellow anthers first appear in the middle of the wheat head. Application should be made when the majority of spikes in the field have reached this stage. Primary spikes can be used as an early guide as the tillers will be 3-4 days behind in development. In areas where early flowering has been missed due to conditions, later applications can be made to achieve some efficacy. Its is essential when thinking about making later applications to check the pre-harvest interval restrictions on labels and to not exceed these.Always follow label instructions.

other Diseases.

With current conditions, Bacterial leaf streak may be observed in fields. There are no methods of control at present other than using less susceptible varieties in future years. Consult the MN and ND variety trials guides to establish which varieties will work best in your area.Bacterial leaf streak can look like other fungal disease such as Septoria, when the lesions become advanced as they look brown and necrotic. It is therefore important to ensure accurate identification.

Septoria may well be observed in fields this year, remember that any application made to control FHB at this time should help control and most of the late season diseases such as Septoria spot blotch and tan spot,so no additional spraying should be required to control these disease in addition to spraying for FHB.

Important Note Important Note: Please review Terms of Use before utilizing this site. This Fusarium Head Blight (FHB, or 'scab') model is a pre-flowering model. It is meant to be applied using weather conditions during the week leading up to flowering. Therefore, the epidemic risk for a particular field should be determined by selecting a time coinciding with or just prior to the initiation of flowering in that field. A growth stage estimator is available on this website, but you should still monitor growth in your own fields to better estimate the date on which flowering begins.